For 2022 tax returns the official FTA exchange rates are:

USD1   =  CHF 0.95497047CHF 0.925228
EUR1   =  CHF 1.00481626CHF 0.987450
GBP1   =  CHF 1.1791102CHF 1.112933

Official foreign exchange rates as of 31 December 2022 are available here. In this list are also included rates to apply for the main cryptocurrencies (these are found with the list of national currencies). These need to be reported in the tax declaration.

BTC 1 = CHF 15,345.739085
ETH 1 = CHF 1,109.251223